Ab Scissors Exercise is one of those essential exercises to have firm abs.

Video Demos on How to do Ab Scissors Exercise

Even though there are lot of machines which says that they replicate the functionality of this ab exercise i think its better to do without any aid as for performing this exercise you donot need any costly machine (frankly why wasting money for a single exercise?)
Best Six Pack Abs Training Book with lots of workout routines to get six pack abs efficiently with great meal / diet plans to cut those extra calories and get awesome six pack abs.

Tagged: abs workout, abs workout videos, six pack abs exercises